The document discusses the Java ring, which is a stainless steel ring containing a computer chip called an iButton that stores user information and runs Java applets. It was introduced in 1998 to provide personalized services. The ring communicates with readers through the iButton and 1-wire protocol with a touch. Applications include access control, time/attendance, e-cash, and more. It has advantages like convenience and security but also risks less parental control and privacy issues.

1. Presented By
Aradhya Kundu

2. Contents
What is a java ring?
History
Working
iButton
Blue Dot Receptor
Comparison with smart cards
Applications
Advantages
Disadvantages
Conclusion

3. What is a Java Ring ?...
The Java Ring is a stainless-steel ring, 16-millimeters (0.6
inches) in diameter, that houses a 1-million-transistor
processor, called an iButton, with built in capabilities for
the user.
Is in fact a java smart card based on Java Virtual Machine
that was proposed as the Java card 2.0, Implements the
Java Card 2.0 API.
The ring has 134 KB of RAM, 32 KB of ROM, a real-time
clock and a Java virtual machine.
Stores information in NVRAM (6K)
Runs applets

4. History…
The java ring was introduced at Sun
Microsystems's JavaOne Conference, in March
1998.It was developed by Dallas Semiconductor.
Workstations at the conference had "ring readers"
installed on them that downloaded information
about the user from the conference registration
system.
This information was then used to enable a
number of personalized services.

5. Contd…
Java ring has been tested at Celebration
School.The rings are given to students and
have been programmed to store electronic
cash to pay for lunches automatically unlock
doors,take attendance, store medical
information ,allow students to check out
books.
Students simply press the signet of their
Java Ring, and it performs the desired
function.

6. Contd…
The rings given to students are programmed
with Java applets that communicate with host
applications on networked systems.
The Java Ring is snapped into a reader, called a
Blue Dot receptor, to allow communication
between a host system and the Java Ring.

7. Working…
Whenever the user pushes his ring on a ring
reader(Blue Dot Receptor), the corresponding
application will take place.
The jewel of the java ring is the iButton. iButton
is a computer chip enclosed in a thick stainless
steel can.
It uses 1-wire protocol for communication with
the host and the iButton.

8. Contd…
Information is transferred between your
iButton and a PC with a momentary contact
at up to 142kbps.
You simply touch your iButton to a Blue Dot
receptor or other iButton probe, which is
connected to a PC.
The Blue Dot receptor is cabled to a 1-Wire
adapter that is attached to a spare PC port. 1-
Wire adapters exist for USB, serial, and
parallel ports.

9. Contd…
The Java Card 2.0 architecture has taken
client/server architectures to a new place -- one
where the "server" is a small piece of software on
an extremely small system, and the client is a
potentially huge piece of software on a potentially
much larger system.
The network protocol is encapsulated in packets
that are called application program data units,
or APDUs for short

10. Contd…
The smart card runtime code gets the first
crack at decoding the APDUs as they arrive
on the serial interface.
Further, there are predefined APDUs that
tell the runtime to select an applet, delete
applets, load applets, and so on.
Thus, errant applets are simply deleted by
the developer once it's ascertained that they
aren't responding correctly to the APDUs
they receive

11. iButton
The iButton is a mechanical packaging
standard that places a 1-Wire component inside
a small stainless steel "button" similar to a disk-
shaped battery.
Each iButton has a unique and unalterable
address laser etched onto its chip inside the can.
The address can be used as a key or identifier
for each iButton.

12. More…
iButtons are connected to 1-Wire bus systems by
means of a socket with contacts which touch the
"lid" and "base" of the canister.
The connection can be fleeting, similar to swiping
a credit card through a reader. Semi-permanent
connections are possible with a different socket
type. (The iButton clips into it, but is easily
removed).

13. Contd…
Unlike EEPROM, the NVRAM iButton memory
can be erased and rewritten as often as necessary
without wearing out.
It can also be erased or rewritten without
requiring the time-consuming programming of
EEPROM.

14. iButton Structure

15. Lay out of iButton

16. Blue Dot Receptor…
The Blue Dot Receptors are iButton
reader/probes that provide a convenient
pipeline into the PC for iButton-to-PC
communication.
The receptor's cable connects to a USB, serial,
or parallel-port 1-Wire adapter, whichever type
of port you wish to use.
The receptor itself easily affixes to any
accessible spot on the front of the PC.

17. Contd…
The user can elect a quick information transfer
with a momentary touch of the iButton to the
Blue Dot.
For hands-free operation the iButton can be
snapped into the Blue Dot and remain there.
Each receptor contains two Blue Dots to
accommodate instances where multiple
iButtons are required for a transaction.

18. Comparison with Smart
Cards…
iButtons have an advantage over conventional smart
cards in term of durability and longevity.
iButtons are rugged enough to withstand harsh
environments.
iButton uses java as a common programming
language.

19. Applications…
Access Control
Time and attendance
eCash
Thermochron Applications
Gaming Systems

20. Advantages…A very easy and convenient way for users.
More secure than using passwords.
Portable. Ruggedness.Wearable.
Provides authentication to users which is crucial for many
applications.
Easier for administrator to maintain the security
infrastructure.
Provides real memory, more power, and a capacity for
dynamic programming

21. Disadvantages…
Parents and teachers will have less control over
children and students
Loss of privacy

22. Conclusion…
The java ring can readily support the
commerce models that have traditionally
been the province of credit cards.
Its greatest promise appears to lie in its
capacity to interact with Internet
applications to support strong remote
authentication and remotely authorized
financial transactions.
The use of Java promotes compatibility with
these applications by providing a common
language for all application programming.

23. THANK YOU